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concrete has set. The values for drainage capacity given in diagram 2 are based on permanent load tests and represent the condition of the sheeting exterpolated for after a 50 year period of use. This shows for example for DELTA-DRAIN, with an installation depth of 2.5 m, a water conduction capacity of 1.3 l/s-m (diagram 2). It is

different with the short-term concreting pressure: concrete of consistency class K2, cast at a rate of climb of 5 m/h, creates a formwork pressure of approximately 60 kN/m2. The water conducting capacity of DELTA-DRAIN under these conditions is approximately 1.6 l/s-m (diagram 3). The diagrams demonstrate that the loads from earth
pressure and concreting pressure arising in practice can easily be accommodated by the stud structure and the special form of the studs; even when viewed long-term only minor compression takes place and the high water conducting capacity of the particular dimpled sheeting is only insignificantly reduced.
delta_technical_20pp_relation_to_the_installation_depth_or_earth_pressure
 Drainage capacity of DELTA®-DRAIN and DELTA®-GEO-DRAIN in relation to the installation depth or earth pressure based on long-term tests.

delta_technical_20pp_formwork_pressure.gif
 Drainage capacity of DELTA®-MS. DELTA®-MS 20. DELTA®-DRAIN, and DELTA®-GEO-DRAIN under the effect of formwork pressure (diagram in accordance with DIN 18218).